Add reporting of purgeable space on MacOS #3206
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Purgeable space is space that macOS can free up when needed by removing files from your computer (you can't manually remove the files that are designated purgeable, but macOS removes them as space is required). So statfs can report low available space when in fact you can use more than that.
Tested on MacOS 14 (x86+M2) and Ubuntu 22.04
Needs to be started as root to get purgeable space info (otherwise it returns 0)